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Based on N(80,20) normal model, what are the cutoff values for
What is the probability that it will be possible to buy a rush ticket. What is the average number of rush tickets available?
Using N(-80,20) Normal model, what percentage of distribution
Assume the probability that an item produced by the certain machine will be defective is 0.1. Determine the probability that the sample of 10 items will contain at most one defective item. Suppose t
Specialty's senior sales forecaster predicted that the demand would be basically distributed with the mean as 20,000 units and that demand would be between 10,000 and 30,000 units with a 90% probab
Determine the standard error of the mean in this example? Compute the likelihood the sample mean is greater than 320 minutes? Estimate the likelihood the sample mean is between 320 and 350 minutes?
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
At the fencing center, 60% of fencers employ the foil as their main weapon. We randomly survey 25 fencers at the fencing center. We are interested in the numbers that don't employ the foil as their
A school newspaper reporter decides to randomly survey 12 students to see if they attend Tet festivities this year. Based on past years, she knows that 18% of studetns attend Tet festivities. We are
Using the sales forecaster prediction to calculate, what is the standard deviation for the demand distribution?
When the data form the 2x2 matrix, the phi-coefficient is employed to determine effect size for the chi-square test for the independence. If other factors are held constant, how does sample size aff
A two-tailed test of hypotheisis was conducted and 60 values were above the median. Computed z=1.61. At the 0.05 level, what is the decision regarding the null hypothesis?
Discuss what is measured through the sample standard deviation. Calculate the estimated standard error for the sample mean and explain what is measured by the standard error.
Suppose the random variable X is best described by a normal distribution with mean= 150 and standard deviation= 15. Find the values of x such that
Come up with an expression that the probability of Z will still be null after this. At the end of this procedure, what is the expected size of Z?
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
Make a 95% confidence interval estimate of the population mean rating for Miami. Enter your answer using parentheses and a comma, in the form (n1, n2).
Someone wonders if movies are too long. A random sample of 45 releases had a mean length of 112.1 minutes and a standard deviation of 22.4 minutes. Construct a 99% confidence interval for the mean l
The production foreman for the Florida fruit company determines that the average sale of the oranges is 4,700 and the standard deviation is 500 oranges. Sales follow the normal distribution. What i
Consequently, the designers want to know the minimum sample size needed so that observing K or fewer defectives in the sample will demonstrate that the true probability of failure for the one-shot d
The mean temp in the LA is 66.3 degrees F with the standard deviation of 8 degrees F. The temp readings are usually distributed. Determine the probability the temp in LA is greater than 85.2 F any g
Suppose that the data has the normal distribution and number of observations is greater than fifty. Find out the critical z value employed to test a null hypothesis.
Time Warner has urbanized a new system to decrease the time customers spend waiting to be served by technical reps during peak business hours.
The mean as well as the standard deviation of the sample of 40 trash bag breaking strengths are 50.575 for the sample mean and the standard deviation is 1.6438.
The mean temp in LA is 66.3 degrees F with the standard deviation of 8 degrees F. The temp readings are normally distributed. What is the probability the temp in LA is between 50.2 and 82.2 F any gi